In a skillet, melt the butter or margarine and sauté the onion and celery until soft. Add the garlic and sauté one more minute.
Add the broccoli to the boiling broth along with the sautéed vegetables. Reduce heat, cover, and simmer 5 to 10 minutes or until the broccoli is just tender.
Mix together the cold milk and rice flour. Add to the soup and stir. Heat to boiling and boil for 1 minute.
Add the chicken, 1 cup water or milk, parsley, basil, salt and pepper. Heat until hot through.
Recipe by The Gluten-Free Homemaker at http://glutenfreehomemaker.com/chicken-and-broccoli-chowder/